一、首先簡單地講一下UITabbarController的使用方法，直接上程式碼：

//初始化tabbarcontroller
- (void)setTabbarController{
    NSArray *array = @[contactsNav, businessNav, infoNav, myCoffeeNav];
    _tabBarController = [[UITabBarController alloc] init];
    [_tabBarController setViewControllers:array];
    //隱藏黑色線條
    [_tabBarController.tabBar setClipsToBounds:YES];
    //設定tabbar的背景顏色
    [[UITabBar appearance] setBackgroundColor:kTabbarBgColor];
    [[UITabBar appearance] setShadowImage:[[UIImage alloc] init]];
    [_tabBarController setSelectedViewController:array[0]];
    //自定義加上一條線
    UILabel *lineLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, WIDTH, 0.5)];
    lineLabel.backgroundColor = HEX_COLOR(@"E5E5E5");
    [_tabBarController.tabBar addSubview:lineLabel];
    //設定item
    [self customizeTabBarForController:_tabBarController];
}
//設定tabbarItem
- (void)customizeTabBarForController:(UITabBarController *)tabBarController {
    NSInteger index = 0;
    NSArray *tabbarImages = @[@"btn_foot_friends", @"btn_foot_bussines", @"btn_foot_message", @"btn_foot_coffee"];
    for (UITabBarItem *item in [[tabBarController tabBar] items]) {
        UIImage *selectedimage = [UIImage imageNamed:[NSString stringWithFormat:@"%@_hover",tabbarImages[index]]];
        UIImage *unselectedimage = [UIImage imageNamed:[NSString stringWithFormat:@"%@",tabbarImages[index]]];
        [item setSelectedImage:[selectedimage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
        [item setImage:unselectedimage];
        CRNavigationController *nav = tabBarController.viewControllers[index];
        NSString *titleStr = [nav.viewControllers[0] title];
        item.title = titleStr;
        [item setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:HEX_COLOR(@"818C9E"),NSForegroundColorAttributeName,[UIFont systemFontOfSize:10],NSFontAttributeName, nil] forState:UIControlStateNormal];
        [item setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:HEX_COLOR(@"E24943"),NSForegroundColorAttributeName,[UIFont systemFontOfSize:10],NSFontAttributeName, nil] forState:UIControlStateSelected];
        item.titlePositionAdjustment = UIOffsetMake(0, -3);
        index++;
    }
}
 

第一步、在UIViewController的基類中新增如下程式碼，我使用的基類名是BaseViewController：

@implementation BaseViewController
- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    self.hidesBottomBarWhenPushed = NO;
}
@end

第二部、在CRNavigationController（繼承於UINavigationController）中重構push方法，程式碼如下：

@implementation CRNavigationController
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
    self.topViewController.hidesBottomBarWhenPushed = YES;
    viewController.hidesBottomBarWhenPushed = YES;
    [super pushViewController:viewController animated:animated];
}
@end